When he comes to my house tomorrow,I______(type)the letter.

问题描述:

When he comes to my house tomorrow,I______(type)the letter.

will have typed

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should be typed

will be typing
是指他在明天那个时候正在写打这封信

will have typed

will be typing
注:when 引导的状语从句,主句用一般将来时(根据句意,应该是将来进行时),从句用一般现在时